Test capability-based printed circuit board assembly design

ABSTRACT

This application discloses a computing system implementing a schematic capture tool to utilize physical test capabilities of a manufacturer of a printed circuit board assembly during generation of a logical design for the printed circuit board assembly. The schematic capture tool can utilize the physical test capabilities of the manufacturer to trim a list of parts representing electronic components available for use in the printed circuit board assembly, and generate the logical design for the printed circuit board assembly utilized the trimmed list of parts. The schematic capture tool can utilize the physical test capabilities of the manufacturer to determine which nets in the logical design to assign test points. The schematic capture tool can provide an indication of the assigned test points to a layout tool, which can include the test points in a layout design for the printed circuit board assembly based on the assignment.

TECHNICAL FIELD

This application is generally related to electronic design automationand, more specifically, to test capability-based printed circuit boardassembly design.

BACKGROUND

The development of electronic devices with printed circuit boardstypically involves many steps known as a design flow. This design flowtypically starts with a specification for a new electronic device to beimplemented with a printed circuit board. The specification of theelectronic device can be transformed into an electronic device design,such as a netlist, for example, by a schematic capture tool or bysynthesizing a logical design, sometimes referred to as a registertransfer level (RTL) description of the electronic device. The netlistmay be specified in an Electronic Design Interchange Format (EDIF) orthe like, which can describe nets or connectivity between variouscomponents or parts in the electronic device design.

The design flow may continue by verifying functionality of theelectronic device design, for example, by simulating, emulating, orprototyping the electronic device design and verifying that the resultsof the simulation or emulation correspond with an expected output fromthe electronic device design. The functionality also can be verified byformally verifying with one or more solvers or statically checking theelectronic device design for various attributes that may be problematicduring operation of the electronic device built utilizing the electronicdevice design.

Once the electronic device design has been functionally verified, thedesign flow may utilize the logical design to generate a layout designfor the electronic device. This procedure can be implemented indifferent ways, but typically, through the use of a layout tool, whichcan place and interconnect various components or parts into arepresentation of a printed circuit board. For example, the layout toolimplemented in a computing system can present a graphical view of theprinted circuit board and allow a designer to utilize the layout tool toplace parts from a library onto the printed circuit board in thegraphical view.

The design flow may perform one or more design for manufacturability(DFM) procedures on the layout design, which can determine whether theelectronic device described in the layout design can be manufactured.The design for manufacturability procedures can include a design forfabrication (DFF) processes, a design for assembly (DFA) processes, adesign for test (DFT) processes, or the like. The design for fabricationprocesses can determine whether a bare printed circuit board can befabricated based on the layout design. The design for assembly processescan determine whether components can be disposed or coupled to theprinted circuit board during assembly of the electronic device. Thedesign for test processes can identify whether testing procedures can beutilized on manufactured electronic devices, for example, to detectprocess defects during assembly, perform electrical verification of amanufactured electronic device, or the like.

The design for test processes may be able to identify whether theelectronic device, when built, can be tested by a particular fabricatorto identify process defects, such as whether a component has been placedand soldered to the printed circuit board correctly. The design for testprocesses also may determine whether the electronic device can beelectrically verified during testing procedures, for example, byperforming at speed testing of the electronic device and samplingsignaling at various test points in the electronic device under test.Often, however, practical constraints, such as fabricator testcapabilities, space on the layout design available for test points, orthe like, may result in the testing procedures to not being able toverify a portion of the electronic device. This inability to test theportion of the electronic device can reduce test coverage and leave theelectronic devices built based on the layout design susceptible toundetected manufacturing-related faults. In other instances, the designfor test processes may determine that a fabricator has the capability oftesting manufactured electronic devices for the layout design, but thetesting procedures may be time-consuming, expensive, or both than otheravailable options. In these instances, the developer of the electronicsystem can decide whether to re-design the electronic device or toaccept the reduced test coverage and/or more time-consuming, expensive,or both testing procedures and move forward with production of theelectronic design.

SUMMARY

This application discloses a computing system implementing a schematiccapture tool to utilize physical test capabilities of a manufacturer ofa printed circuit board assembly during generation of a logical designfor the printed circuit board assembly. The schematic capture tool canutilize the physical test capabilities of the manufacturer to trim alist of parts representing electronic components available for use inthe printed circuit board assembly, and generate the logical design forthe printed circuit board assembly utilized the trimmed list of parts.The schematic capture tool can utilize the physical test capabilities ofthe manufacturer to determine which nets in the logical design to assigntest points. The schematic capture tool can provide an indication of theassigned test points to a layout tool, which can include the test pointsin a layout design for the printed circuit board assembly based on theassignment. Embodiments will be described below in greater detail.

DESCRIPTION OF THE DRAWINGS

FIGS. 1 and 2 illustrate an example of a computer system of the typethat may be used to implement various embodiments.

FIG. 3 illustrates an example of a design system with a schematiccapture tool to utilize test capabilities of a manufacturer to generatea logical design of a printed circuit board assembly according tovarious embodiments.

FIG. 4 illustrates an example of the schematic capture tool according tovarious embodiments.

FIG. 5 illustrates an example flowchart for utilizing test capabilitiesof a manufacturer to generate a logical design of a printed circuitboard assembly according to various embodiments.

DETAILED DESCRIPTION Illustrative Operating Environment

Various examples of the invention may be implemented through theexecution of software instructions by a computing device 101, such as aprogrammable computer. Accordingly, FIG. 1 shows an illustrative exampleof a computing device 101. As seen in this figure, the computing device101 includes a computing unit 103 with a processing unit 105 and asystem memory 107. The processing unit 105 may be any type ofprogrammable electronic device for executing software instructions, butwill conventionally be a microprocessor. The system memory 107 mayinclude both a read-only memory (ROM) 109 and a random access memory(RAM) 111. As will be appreciated by those of ordinary skill in the art,both the read-only memory (ROM) 109 and the random access memory (RAM)111 may store software instructions for execution by the processing unit105.

The processing unit 105 and the system memory 107 are connected, eitherdirectly or indirectly, through a bus 113 or alternate communicationstructure, to one or more peripheral devices 117-123. For example, theprocessing unit 105 or the system memory 107 may be directly orindirectly connected to one or more additional memory storage devices,such as a hard disk drive 117, which can be magnetic and/or removable, aremovable optical disk drive 119, and/or a flash memory card. Theprocessing unit 105 and the system memory 107 also may be directly orindirectly connected to one or more input devices 121 and one or moreoutput devices 123. The input devices 121 may include, for example, akeyboard, a pointing device (such as a mouse, touchpad, stylus,trackball, or joystick), a scanner, a camera, and a microphone. Theoutput devices 123 may include, for example, a monitor display, aprinter and speakers. With various examples of the computing device 101,one or more of the peripheral devices 117-123 may be internally housedwith the computing unit 103. Alternately, one or more of the peripheraldevices 117-123 may be external to the housing for the computing unit103 and connected to the bus 113 through, for example, a UniversalSerial Bus (USB) connection.

With some implementations, the computing unit 103 may be directly orindirectly connected to a network interface 115 for communicating withother devices making up a network. The network interface 115 cantranslate data and control signals from the computing unit 103 intonetwork messages according to one or more communication protocols, suchas the transmission control protocol (TCP) and the Internet protocol(IP). Also, the network interface 115 may employ any suitable connectionagent (or combination of agents) for connecting to a network, including,for example, a wireless transceiver, a modem, or an Ethernet connection.Such network interfaces and protocols are well known in the art, andthus will not be discussed here in more detail.

It should be appreciated that the computing device 101 is illustrated asan example only, and it not intended to be limiting. Various embodimentsof the invention may be implemented using one or more computing devicesthat include the components of the computing device 101 illustrated inFIG. 1, which include only a subset of the components illustrated inFIG. 1, or which include an alternate combination of components,including components that are not shown in FIG. 1. For example, variousembodiments of the invention may be implemented using a multi-processorcomputer, a plurality of single and/or multiprocessor computers arrangedinto a network, or some combination of both.

With some implementations of the invention, the processor unit 105 canhave more than one processor core. Accordingly, FIG. 2 illustrates anexample of a multi-core processor unit 105 that may be employed withvarious embodiments of the invention. As seen in this figure, theprocessor unit 105 includes a plurality of processor cores 201A and201B. Each processor core 201A and 201B includes a computing engine 203Aand 203B, respectively, and a memory cache 205A and 205B, respectively.As known to those of ordinary skill in the art, a computing engine 203Aand 203B can include logic devices for performing various computingfunctions, such as fetching software instructions and then performingthe actions specified in the fetched instructions. These actions mayinclude, for example, adding, subtracting, multiplying, and comparingnumbers, performing logical operations such as AND, OR, NOR and XOR, andretrieving data. Each computing engine 203A and 203B may then use itscorresponding memory cache 205A and 205B, respectively, to quickly storeand retrieve data and/or instructions for execution.

Each processor core 201A and 201B is connected to an interconnect 207.The particular construction of the interconnect 207 may vary dependingupon the architecture of the processor unit 105. With some processorcores 201A and 201B, such as the Cell microprocessor created by SonyCorporation, Toshiba Corporation and IBM Corporation, the interconnect207 may be implemented as an interconnect bus. With other processorunits 201A and 201B, however, such as the Opteron™ and Athlon™ dual-coreprocessors available from Advanced Micro Devices of Sunnyvale, Calif.,the interconnect 207 may be implemented as a system request interfacedevice. In any case, the processor cores 201A and 201B communicatethrough the interconnect 207 with an input/output interface 209 and amemory controller 210. The input/output interface 209 provides acommunication interface to the bus 113. Similarly, the memory controller210 controls the exchange of information to the system memory 107. Withsome implementations of the invention, the processor unit 105 mayinclude additional components, such as a high-level cache memoryaccessible shared by the processor cores 201A and 201B. It also shouldbe appreciated that the description of the computer network illustratedin FIG. 1 and FIG. 2 is provided as an example only, and it not intendedto suggest any limitation as to the scope of use or functionality ofalternate embodiments of the invention.

Test Capability-Based Schematic Capture of a Printed Circuit BoardAssembly Design

FIG. 3 illustrates an example of a design system 300 with a schematiccapture tool 310 to utilize test capabilities 303 of a manufacturer togenerate a logical design of a printed circuit board assembly accordingto various embodiments. Referring to FIG. 3, the design system 300 canbe a distributed design environment, which allow for a design of aprinted circuit board assembly to be performed by differentcommunicating tools or systems.

The design system 300 can include a schematic capture tool 310 toreceive a parts library 301 and test capabilities 303 of a manufacturer.The parts library 301 can include parts that represent electroniccomponents available for use in a printed circuit board assembly. Theparts can describe the electronic components, for example, byidentifying types of the electronic components and the pins, ports, orinterfaces of the electronic components. In some embodiments, the partsalso may describe electrical characteristics of the electroniccomponents and/or include physical characteristics of the electroniccomponents, such as footprints of the electronic components, sizes ofthe electronic components, shapes of the electronic components, or thelike. The parts in the parts library 301 can describe test procedures ortest equipment to utilize to test the electronic components representedby the corresponding parts.

The test capabilities 303 can describe types of tests the manufacturercan perform on the printed circuit board assembly, which equipment themanufacturer can utilize to perform the tests on the printed circuitboard assembly, a throughput of the tests and test equipment, an expenseassociated with the tests, or the like. In some embodiments, themanufacturer may support or be able to perform one or more of anAutomated Optical Inspection (AOI) test, an Automated X-Ray Inspection(AXI) test, an In-circuit Test (ICT), a Boundary Scan test, a FlyingProbe Test (FPT), manual inspection tests, manual electrical tests, orthe like.

The schematic capture tool 310 can generate a logical design for theprinted circuit board assembly utilizing the parts from the partslibrary 301. The logical design for the printed circuit board assemblycan include a netlist 311 and a parts list 312. The netlist 311, forexample, specified in an Electronic Design Interchange Format (EDIF),can describe nets or connectivity between various components orinstances. The parts list 312 can include multiple parts from the partslibrary 301, which can correspond to the components or instancesdescribed in the netlist 311.

The schematic capture tool 310 can utilize the test capabilities 303 ofthe manufacturer for the printed circuit board assembly to modify thedevelopment process of the logical design for the printed circuit boardassembly. The schematic capture tool 310 can redact or trim the parts inthe parts library 301 available for inclusion in the logical design ofthe printed circuit board assembly. The schematic capture tool 310 canutilize the test capabilities 303 to identify which of the partsrepresent electronic components that, if included in the printed circuitboard assembly, would be untestable by the manufacturer and remove theability of untestable parts from being included in the logical designfor the printed circuit board assembly. For example, when a part in theparts library 301 corresponds to a Ball Grid Array (BGA) package, a testof an electronic component represented by that part would be performedby x-ray techniques, as the pins lie underneath the electronic componentdisposed on the printed circuit board assembly. When the testcapabilities 303 for the manufacturer do not include the ability toperform an x-ray test, such as an Automated X-Ray Inspection (AXI) test,the schematic capture tool 310 can exclude the part from being utilizedin the logical design for the printed circuit board assembly. Theschematic capture tool 310 can identify how to test each electroniccomponent represented by the corresponding parts, for example,identifying test procedures or test equipment the manufacturer shouldutilize to test the electronic components. The schematic capture tool310 can identify how to test each electronic component from adescription of a corresponding part in the parts library 301, or byanalyzing the physical characteristics of the electronic componentsdescribed in the parts to ascertain how a manufacturer would test theelectronic components.

As will be described below in greater detail, the schematic capture tool310 can utilize an amount of space available for test points and thetest capabilities 303 of the manufacturer to assign test points during alogical design phase. The schematic capture tool 310 can incorporate theassignment of test points into the netlist 311 and/or parts list 312 oroutputted separately as a test point indicator 313, which can direct,prompt, or advise downstream tools in the design system 300, such as aprinted circuit board layout tool 320, where to include test points intoa physical design of the printed circuit board assembly.

The design system can include the printed circuit board layout tool 320to receive the logical design of the printed circuit board assembly,such as the netlist 311 and the parts list 312 from the schematiccapture tool 310, and convert the logical design into a physical designor layout design 321 of the printed circuit board assembly. The printedcircuit board layout tool 320 can provide a design environment to layoutthe netlist 311 into the layout design 321 by placing parts orcomponents from a parts list 312 onto the representation of printedcircuit board. The layout design 321 can describe the electronic devicefor the product in terms of various components placed and interconnectedon a representation of a printed circuit board.

The printed circuit board layout tool 320 can output a displaypresentation that, when displayed by a display device, can provide anuser interface to the design environment, allowing the printed circuitboard layout tool 320 to generate the layout design 321 in response touser input. The display presentation can include a graphical displaywindow including at least one representation of the layout design 321and include various tools or embedded functionality that can allowplacement of parts or components from the parts list 312 into the layoutdesign 321.

The layout design 321 initially can represent a blank print circuitboard, for example, having dimensions corresponding to one or more ofthe physical constraints. The printed circuit board layout tool 320 canreceive user input, for example, based on the display presentation,which can prompt the printed circuit board layout tool 320 to performvarious updates to the layout design 321 based on the netlist 311, suchas place parts selected from the parts list 312 in the layout design321, route traces between the placed parts, or the like. In someembodiments, the printed circuit board layout tool 320, in response to auser selection of a part from the parts list 312, can access a libraryto identify a component model corresponding to the selected part capableof being placed in the representation of the layout design 321.

The printed circuit board layout tool 320 can identify the assignment oftest points by the schematic capture tool 310, for example, from thetest point indicator 313 or within the netlist 311 and/or parts list312. The printed circuit board layout tool 320 can utilize theassignment of the tests points to add test points to the layout design321. In some embodiments, the assignment of test points may identifywhich nets in the net list 311 for the printed circuit board layout tool320 to add test points in the layout design 321, which type of testpoint to add, or the like.

The design system 300 can include a design for manufacturability (DFM)tool 330 to determine whether the layout design 321 can be manufacturedand tested by one or more fabricators. The design for manufacturabilitytool 330 can perform a design for fabrication (DFF) analysis, a designfor assembly (DFA) analysis, a design for test (DFT) analysis, or thelike. The design for manufacturability tool 330 can perform the designfor fabrication analysis to determine whether a bare printed circuitboard can be fabricated based on the layout design. The design formanufacturability tool 330 can perform the design for assembly analysisto determine whether components can be disposed or coupled to theprinted circuit board during assembly of the electronic device. Thedesign for manufacturability tool 330 can perform the design for testanalysis to identify whether testing procedures can be utilized onmanufactured electronic devices, for example, to detect process defectsduring assembly, perform electrical verification of a manufacturedelectronic device, or the like. In some embodiments, the design formanufacturability tool 330 can output a design for test report 331,which can identify whether the printed circuit board assembly describedin the layout design 321 can be tested, whether portions of the printedcircuit board assembly cannot be tested by the manufacturer, anestimated cost of the testing procedures, an expected throughput of thetests performed by the manufacturer, yield estimates, or the like.

FIG. 4 illustrates an example of a schematic capture tool 400 to utilizetest capabilities 403 of a manufacturer to generate a logical design ofa printed circuit board assembly according to various embodiments.Referring to FIG. 4, the schematic capture tool 400 can receive a partslibrary 401 and test capabilities 403 of a manufacturer, which can besimilar to the parts library 301 and test capabilities 303 describedabove in FIG. 3.

The schematic capture tool 400 can generate a logical design for theprinted circuit board assembly, which can include a netlist 404 and aparts list 405. The netlist 404 and the parts list 405 can be similar tothe netlist 311 and the parts list 312 described above in FIG. 3. Insome embodiments, the schematic capture tool 400 can generate a displaypresentation that, when presented by a display device, can provide adesign environment for development of the logical design for the printedcircuit board assembly. The schematic capture tool 400 can receive userinput via a user interface, for example, selection of one or more partsfrom the parts library 401 for inclusion in the logical design. Thedisplay presentation may add schematic diagrams of the selected parts tothe design environment and interconnect them in response to the userinput. The schematic capture tool 400 can convert the schematic diagramsand interconnections from the design environment into the netlist 404and the parts list 405.

The schematic capture tool 400 can include a component filtering unit410 to select which of the parts in the parts library 401 to makeavailable for inclusion in the logical design of the printed circuitboard assembly. The component filtering unit 410 can include a testcapability unit 411 to exclude one or more of the parts in the partslibrary 401 parts from being included in the logical design for theprinted circuit board assembly based on the test capabilities 403. Insome embodiments, the test capability unit 411 can utilize the testcapabilities 403 to identify which of the parts represent electroniccomponents that, if included in the printed circuit board assembly,would be untestable by the manufacturer and remove the ability ofuntestable parts from being included in the logical design for theprinted circuit board assembly. For example, when a part in the partslibrary 401 corresponds to a Ball Grid Array (BGA) package, a test of anelectronic component represented by that part would be performed by anx-ray test, as the pins lie underneath the electronic component whendisposed on the printed circuit board assembly. When the testcapabilities 403 for the manufacturer do not include the ability toperform an x-ray test, such as an Automated X-Ray Inspection (AXI) test,the test capability unit 411 can exclude the part from being utilized inthe logical design for the printed circuit board assembly. In someembodiments, the test capability unit 411 can perform this exclusion byremoving the part from view from a designer utilizing the designenvironment or by rendering the part unselectable in response to userinput.

In some embodiments, when the test capability unit 411 identifies atestable part in the part library 401 based on the test capabilities403, the test capability unit 411 also may determine whether toselectively exclude the testable part from being utilized in the logicaldesign for the printed circuit board assembly. The test capability unit411 may analyze the testable parts based on the various tests proceduresor test equipment have differing test throughput, accuracy, expense, orthe like, which could be utilized by the manufacturer. For example, whena first part is testable by an x-ray test and a second part,interchangeable with the first part, is testable by a different test,such as an Automated Optical Inspection (AOI) test, the test capabilityunit 411 may selectively exclude the first part from being utilized inthe logical design for the printed circuit board assembly. In someembodiments, rather than exclude the first part from being utilized, thetest capability unit 411 may annotate the first part to convey the addedtest expense, reduce test throughput, reduced accuracy, or otherdifferences with the second part, to the designer utilizing the firstpart in the logical design for the printed circuit board assembly.

In another example, the test capability unit 411 also may filter theparts in the parts library 401 based on previous utilization of otherparts in the logical design. For example, when the development of thelogical design includes parts representing electronic componentstestable by one type of electrical test or inspection test, the testcapability unit 411 may exclude parts in the parts library 401 frombeing utilized in the logical design for the printed circuit boardassembly that would introduce a different type of electrical test orinspection test. This part exclusion may be able to eliminate themanufacturer having to perform multiple electrical tests or inspectiontests, or to prohibit switching the testing from one type of testing,for example, a cheaper, faster, and/or more accurate testing type, to adifferent testing type through the inclusion of certain parts into thelogical design. In some embodiments, rather than exclude the parts frombeing utilized, the test capability unit 411 may annotate the parts toconvey the added test expense, reduce test throughput, reduced accuracy,or the like, to the designer utilizing the parts in the logical designfor the printed circuit board assembly.

The schematic capture tool 400 can include a test coverage unit 420 toassign test points corresponding to nets in the logical design based onthe parts library 401 and/or the test capabilities 403. The test pointscan correspond to physical structures in the printed circuit boardassembly that can allow testing equipment electrical access to testelectronic components and their connectivity in the printed circuitboard assembly.

The test coverage unit 420 can identify an amount of space in theprinted circuit board assembly available for test points. In someembodiments, the test coverage unit 420 can analyze physicalcharacteristics of electronic components represented by parts in thelogical design, for example, from the parts library 401, to identify theamount of space in the printed circuit board assembly available for testpoints. The test coverage unit 420 can utilize the parts library 401 todetermine physical characteristics of the electrical componentsrepresented by the parts in the logical design, such as their footprint,size, and/or shape. The test coverage unit 420 can identify a differencebetween the total amount of space on the printed circuit board and thespace utilized by the parts in the logical design based on thedetermined physical characteristics. This difference can correspond tothe amount of space in the printed circuit board assembly available fortest points.

The test coverage unit 420 can utilize the determined amount of spaceavailable for test points and the test capabilities 403 of themanufacturer to assign test points in the logical design. The testcoverage unit 420 can determine a number of test points that could beincluded on the printed circuit board assembly based on the amount ofspace available for test points and a test point size. Since a type oftest point added to a printed circuit board assembly can vary, forexample, depending on the type of testing to be performed by themanufacturer, the test coverage unit 420 can identify the type oftesting to be performed by the manufacturer based on the testcapabilities 403 and the types of parts utilized in the logical design,and then select a type of test point to assign.

In some embodiments, the test coverage unit 420 may attempt to ensureevery net in the logical design is testable. The test coverage unit 420can identify which of the nets in the logical design may be testedwithout a test point. For example, a boundary scan test may be able totest multiple nets located on the printed circuit board assembly withoututilizing test points. The test coverage unit 420 can identify whetherthe manufacturer can perform a boundary scan test or other test withoutthe use of test points, identify which of the nets in the logical designcan be tested by the boundary scan test or the like, and assign testpoints to correspond to the other nets in the logical design.

In some embodiments, the assignment of test points to nets in thelogical design by the test coverage unit 420 can include an annotationof which nets should have corresponding test points in a layout designor physical design and in manufactured printed circuit board assemblies.This annotation can be inserted assignment of test points into thenetlist 404 and/or parts list 405 or the assignment of test points canbe outputted separately as a test point indicator 406. The assignment oftest points can direct, prompt, or advise downstream tools, such as aprinted circuit board layout tool, where to include test points into aphysical design of the printed circuit board assembly.

FIG. 5 illustrates an example flowchart for utilizing test capabilitiesof a manufacturer to generate a logical design of a printed circuitboard assembly according to various embodiments. Referring to FIG. 5, ina block 501, a computing system implementing a schematic capture toolcan identify parts representing electronic components available for usein a printed circuit board assembly. In some embodiments, the schematiccapture tool can receive or have access to a parts library, which caninclude descriptions of parts available for inclusion in a logicaldesign of the printed circuit board assembly. The parts may include adescription of the electronic components they represent, such asfunctional descriptions, physical characteristics, or the like of theelectronic components they represent.

In a block 502, the schematic capture tool can trim the parts into asubset of the parts based on test capabilities of a manufacturer for theprinted circuit board assembly. For example, the schematic capture toolcan automatically exclude certain parts from the parts library frombeing included in the logical design for the printed circuit boardassembly due to test considerations, such as an ability for themanufacturer to test the electronic components in the printed circuitboard assembly, cost of testing associated with utilizing the electroniccomponents in the printed circuit board assembly, testing throughput,testing accuracy, or the like.

The test capabilities can describe types of tests the manufacturer canperform on the printed circuit board assembly, which equipment themanufacturer can utilize to perform the tests on the printed circuitboard assembly, a throughput of the tests and test equipment, an expenseassociated with the tests, or the like. In some embodiments, themanufacturer may support or be able to perform one or more of anAutomated Optical Inspection (AOI) test, an Automated X-Ray Inspection(AXI) test, an In-circuit Test (ICT), a Boundary Scan test, a FlyingProbe Test (FPT), manual inspection tests, manual electrical tests, orthe like.

The schematic capture tool can utilize the test capabilities to identifywhich of the parts represent electronic components that, if included inthe printed circuit board assembly, would be untestable by themanufacturer and remove the ability of untestable parts from beingincluded in the logical design for the printed circuit board assembly.In some embodiments, the schematic capture tool can perform thisexclusion by removing the part from view from a designer utilizing adesign environment or by rendering the part unselectable in response touser input.

In some embodiments, when the schematic capture tool identifies atestable part in the part library based on the test capabilities, theschematic capture tool also can determine whether to selectively excludethe testable part from being utilized in the logical design for theprinted circuit board assembly. The schematic capture tool can analyzethe testable parts based on the various tests procedures or testequipment have differing test throughput, accuracy, expense, or thelike, which could be utilized by the manufacturer, and may selectivelyexclude one or more of the testable parts from being utilized in thelogical design for the printed circuit board assembly. In someembodiments, rather than exclude testable parts from being utilized, theschematic capture tool may annotate one or more of the testable parts toconvey the added test expense, reduce test throughput, reduced accuracy,or other differences with the other testable parts. The testable partsalso may filter the parts in the parts library based on previousutilization of other parts in the logical design, for example, excludingparts in the parts library 401 from being utilized in the logical designfor the printed circuit board assembly that would introduce a differenttype of electrical test or inspection test.

In a block 503, the schematic capture tool can generate a logical designfor the printed circuit board assembly, which includes a netlist and aparts list having one or more of the parts from the selected subset ofthe parts. The netlist, for example, specified in an Electronic DesignInterchange Format (EDIF), can describe nets or connectivity betweenvarious components or instances. The parts list can include multipleparts from the parts library, which can correspond to the components orinstances described in the netlist.

The schematic capture tool can provide an electronic design environment,which can build or generate the logical design based on user input. Forexample, the schematic capture tool can generate a display presentationthat, when presented by a display device, can provide the electronicdesign environment for development of the logical design for the printedcircuit board assembly. The schematic capture tool can receive the userinput via a user interface, for example, selection of one or more partsfrom the parts library for inclusion in the logical design. The displaypresentation may add schematic diagrams of the selected parts to thedesign environment and interconnect them in response to the user input.The schematic capture tool can convert the schematic diagrams andinterconnections from the design environment into the netlist and theparts list.

In a block 504, the schematic capture tool can utilize the logicaldesign to assign test points for the printed circuit board assemblybased on the test capabilities of the manufacturer. The test points cancorrespond to physical structures in the printed circuit board assemblythat can allow testing equipment electrical access to test electroniccomponents and their connectivity in the printed circuit board assembly.In some embodiments, the schematic capture tool can analyze the testcapabilities of the manufacturer to identify which of the nets in thelogical design can be tested without adding one or more test points, andthen assign the test points for the printed circuit board assembly toother nets in the logical design.

The schematic capture tool can assign test points to nets in the logicaldesign by including an annotation of which nets should havecorresponding test points in a physical design of a printed circuitboard assembly. The schematic capture tool can insert the assignment oftest points into the logical design or output the assignment separatelyas a test point indicator. The assignment of test points can direct,prompt, or advise downstream tools, such as a printed circuit boardlayout tool, where to include test points into the physical design ofthe printed circuit board assembly.

The system and apparatus described above may use dedicated processorsystems, micro controllers, programmable logic devices, microprocessors,or any combination thereof, to perform some or all of the operationsdescribed herein. Some of the operations described above may beimplemented in software and other operations may be implemented inhardware. Any of the operations, processes, and/or methods describedherein may be performed by an apparatus, a device, and/or a systemsubstantially similar to those as described herein and with reference tothe illustrated figures.

The processing device may execute instructions or “code” stored inmemory. The memory may store data as well. The processing device mayinclude, but may not be limited to, an analog processor, a digitalprocessor, a microprocessor, a multi-core processor, a processor array,a network processor, or the like. The processing device may be part ofan integrated control system or system manager, or may be provided as aportable electronic device configured to interface with a networkedsystem either locally or remotely via wireless transmission.

The processor memory may be integrated together with the processingdevice, for example RAM or FLASH memory disposed within an integratedcircuit microprocessor or the like. In other examples, the memory maycomprise an independent device, such as an external disk drive, astorage array, a portable FLASH key fob, or the like. The memory andprocessing device may be operatively coupled together, or incommunication with each other, for example by an I/O port, a networkconnection, or the like, and the processing device may read a filestored on the memory. Associated memory may be “read only” by design(ROM) by virtue of permission settings, or not. Other examples of memorymay include, but may not be limited to, WORM, EPROM, EEPROM, FLASH, orthe like, which may be implemented in solid state semiconductor devices.Other memories may comprise moving parts, such as a known rotating diskdrive. All such memories may be “machine-readable” and may be readableby a processing device.

Operating instructions or commands may be implemented or embodied intangible forms of stored computer software (also known as “computerprogram” or “code”). Programs, or code, may be stored in a digitalmemory and may be read by the processing device. “Computer-readablestorage medium” (or alternatively, “machine-readable storage medium”)may include all of the foregoing types of memory, as well as newtechnologies of the future, as long as the memory may be capable ofstoring digital information in the nature of a computer program or otherdata, at least temporarily, and as long at the stored information may be“read” by an appropriate processing device. The term “computer-readable”may not be limited to the historical usage of “computer” to imply acomplete mainframe, mini-computer, desktop or even laptop computer.Rather, “computer-readable” may comprise storage medium that may bereadable by a processor, a processing device, or any computing system.Such media may be any available media that may be locally and/orremotely accessible by a computer or a processor, and may includevolatile and non-volatile media, and removable and non-removable media,or any combination thereof.

A program stored in a computer-readable storage medium may comprise acomputer program product. For example, a storage medium may be used as aconvenient means to store or transport a computer program. For the sakeof convenience, the operations may be described as variousinterconnected or coupled functional blocks or diagrams. However, theremay be cases where these functional blocks or diagrams may beequivalently aggregated into a single logic device, program or operationwith unclear boundaries.

CONCLUSION

While the application describes specific examples of carrying outembodiments of the invention, those skilled in the art will appreciatethat there are numerous variations and permutations of the abovedescribed systems and techniques that fall within the spirit and scopeof the invention as set forth in the appended claims. For example, whilespecific terminology has been employed above to refer to electronicdesign automation processes, it should be appreciated that variousexamples of the invention may be implemented using any desiredcombination of electronic design automation processes.

One of skill in the art will also recognize that the concepts taughtherein can be tailored to a particular application in many other ways.In particular, those skilled in the art will recognize that theillustrated examples are but one of many alternative implementationsthat will become apparent upon reading this disclosure.

Although the specification may refer to “an”, “one”, “another”, or“some” example(s) in several locations, this does not necessarily meanthat each such reference is to the same example(s), or that the featureonly applies to a single example.

1. A method comprising: identifying, by a schematic capture toolimplemented with a computing system, parts representing electroniccomponents available for use in a printed circuit board assembly;selecting, by the schematic capture tool, a subset of the partsrepresenting the electronic components based, at least in part, onphysical test capabilities of a manufacturer for the printed circuitboard assembly; and generating, by the schematic capture tool, a logicaldesign for the printed circuit board assembly, wherein the logicaldesign includes a netlist and a parts list having one or more of theparts from the selected subset of the parts.
 2. The method of claim 1,wherein selecting the subset of the parts further comprises identifyingwhich test procedures to utilize to test the electronic componentscorresponding to the parts and selecting the subset of the parts basedon the identified test procedures and physical test capabilities of themanufacturer.
 3. The method of claim 2, wherein selecting the subset ofthe parts further comprises excluding at least one of the identifiedparts from the subset of the parts when the manufacturer does not havethe physical test capabilities to perform the identified test procedurescorresponding to the at least one of the identified parts.
 4. The methodof claim 1, further comprising assigning, by the schematic capture tool,test points for the printed circuit board assembly based on the physicaltest capabilities of the manufacturer.
 5. The method of claim 4, whereinthe assigned test points are configured to identify nets in the logicaldesign of the printed circuit board assembly that are to have thecorresponding test points in a layout design of the printed circuitboard assembly.
 6. The method of claim 1, wherein the physical testcapabilities associated with the manufacturer includes an identificationof test equipment available to the manufacturer.
 7. The method of claim1, wherein the selected subset of the parts includes one or more of theparts having physical characteristics capable of being tested by testequipment utilized by the manufacturer.
 8. A system comprising: a memorydevice configured to store machine-readable instructions; and acomputing system including one or more processing devices, in responseto executing the machine-readable instructions, configured to: identifyparts representing electronic components available for use in a printedcircuit board assembly; select a subset of the parts representing theelectronic components based, at least in part, on physical testcapabilities of a manufacturer for the printed circuit board assembly;and generate a logical design for the printed circuit board assembly,wherein the logical design includes a netlist and a parts list havingone or more of the parts from the selected subset of the parts.
 9. Thesystem of claim 8, wherein the one or more processing devices, inresponse to executing the machine-readable instructions, are furtherconfigured to select the subset of the parts by identifying which testprocedures to utilize to test the electronic components corresponding tothe parts and selecting the subset of the parts based on the identifiedtest procedures and physical test capabilities of the manufacturer. 10.The system of claim 9, wherein the one or more processing devices, inresponse to executing the machine-readable instructions, are furtherconfigured to select the subset of the parts by excluding at least oneof the identified parts from the subset of the parts when themanufacturer does not have the physical test capabilities to perform theidentified test procedures corresponding to the at least one of theidentified parts.
 11. The system of claim 8, wherein the one or moreprocessing devices, in response to executing the machine-readableinstructions, are configured to assigning test points for the printedcircuit board assembly based on the physical test capabilities of themanufacturer.
 12. The system of claim 11, wherein the assigned testpoints are configured to identify nets in the logical design of theprinted circuit board assembly that are to have the corresponding testpoints in a physical design of the printed circuit board assembly. 13.The system of claim 8, wherein the selected subset of the parts includesone or more of the parts having physical characteristics capable ofbeing tested by test equipment utilized by the manufacturer.
 14. Anapparatus comprising at least one computer-readable memory devicestoring instructions configured to cause one or more processing devicesto perform operations comprising: identifying parts representingelectronic components available for use in a printed circuit boardassembly; selecting a subset of the parts representing the electroniccomponents based, at least in part, on physical test capabilities of amanufacturer for the printed circuit board assembly; and generating alogical design for the printed circuit board assembly, wherein thelogical design includes a netlist and a parts list having one or more ofthe parts from the selected subset of the parts.
 15. The apparatus ofclaim 14, wherein selecting the subset of the parts further comprisesidentifying which test procedures to utilize to test the electroniccomponents corresponding to the parts and selecting the subset of theparts based on the identified test procedures and physical testcapabilities of the manufacturer.
 16. The apparatus of claim 15, whereinselecting the subset of the parts further comprises excluding at leastone of the identified parts from the subset of the parts when themanufacturer does not have the physical test capabilities to perform theidentified test procedures corresponding to the at least one of theidentified parts.
 17. The apparatus of claim 14, wherein theinstructions configured to cause the one or more processing devices toperform operations further comprising assigning test points for theprinted circuit board assembly based on the physical test capabilitiesof the manufacturer.
 18. The apparatus of claim 17, wherein the assignedtest points are configured to identify nets in the logical design of theprinted circuit board assembly that are to have the corresponding testpoints in a layout design of the printed circuit board assembly.
 19. Theapparatus of claim 14, wherein the physical test capabilities associatedwith the manufacturer includes an identification of test equipmentavailable to the manufacturer.
 20. The apparatus of claim 14, whereinthe selected subset of the parts includes one or more of the partshaving physical characteristics capable of being tested by testequipment utilized by the manufacturer.